)
For me, other gifs like "[this":](/images/2524786?q=twilight+sparkle), including my other ones like "[this one":](/images/2475220?q=artist%3Aursamanner) loop properly. Maybe it's about gif being long, over 5 seconds or so, but I have uploaded such gif once and it was ok ( "[here":](/images/2406890?q=artist%3Aursamanner) ). Do they loop for you as well?
Also, this gif is compressed to way smaller than the last one I mentioned above (the one over 5 sec). Could this cause an issue?